The shoulder girdle is composed of multiple joints: scapulothoracic, sternoclavicular, acromioclavicular, and glenohumeral joint. The glenohumeral joint is responsible for the largest degree of motion. The muscles that attach to it are: m. infraspinatus, m. supraspinatus, m. teres minor, m. subscapularis and by some literature long head of m. biceps brachii. It is worth mentioning that motion in the shoulder is possible due to the synergy of all 4 joints and their rhythm of movement. There are a couple of theories that explain how rotator cuff tears appear. Some authors advocate there are intrinsic factors as degeneration of tissue due to a wide variety of reasons, while others advocate extrinsic factors like a traumatic event or anatomical variations. Also, there is the classification of tears by place and size, from little tears that are less than 1 cm in diameter to massive tears that are bigger than 5 cm in diameter. For diagnostics, there is a wide specter of tests that are being used but to be sure about the amplitude of tear clinical imaging is an unavoidable part of diagnostics. In therapy, all kind of modalities is used as heat, ice, ultrasound, currents, and motion as the main driver for healing and adaptation. Exercises are done under a protocol that is used as guidance and according to patients' ability to do them, they are changed and adjusted. Rehabilitation usually lasts from 4 and a half months to more than a year dependant on the localization and size of the tear.